Improvement in asphalt roads and pavements



respects.

atria EDOUARD J. DESMEDT, OF NEW YORK, N. Y., ASSIGNOR TO GRAHAMITE ASPHALT COMPANY, OF SAME PLACE.

Letters Patent No. 110,121, dated December 13, 1870.

The Schedule referred to in these Letters Patent and making part of the same.

"&c., as follows:

Grahamite and albertite are similar natural substances belonging to thefamily of asphaltuni, but they diii'er from ordinary asphalts in a great many I shall not undertake now to describe all the chemical dilterences between those iorenamed .minerals and ordinary asphalts, it being only necessary to state that by their peculiar composition they possess qualities peculiarly adapted for the constructlon of asphalt roads which other asphalts do not possess.

Road constructed with these minerals, and princijpally by the method which I shall give hereafter, will tions to arrive at good results. 1

To arrive at the said required results, I decompose the forenained minerals by distillation into hydrocarbon oil, petroline, sometimes called bitumen, and

coke; the coke is left in the retort, and the hydrocarbon oil, keeping in solution the petroline, passes over in vapors and is condensed.

To isolate the petroline, the condensed oil is dis-.

tilled again until 50 per cent. of oil has been obtained, and what is left in the stillis ,petroline.

'lhis petroline, melting under a higher degree of heat than ordinary heat, possesses an elasticity which I never observed in other petroline, and is therefore, as I stated before, better adapted for asphalt roads than any other, and, by thecombination of the grahamite or albertite with this petroline in difi'erent proportions, asphalts are obtained suitable for various degrees of temperature, as high as 300.

This peculiar petroline, which I term grahamite pet-roline, is used for the combination with grahamite alhertite, or any other hard asphaltuni, in the following manner:

G raha-mite, albertite, or any other hard asphaltums, from 20 per cent. to 70 per cent. parts; grahamite:

petroline, 30 per cent. to 80 percent. sand or powdered stone, such as limestone, or any other, from 300 to 700 parts.

'lhe petroline and grahamite beinglnelted together, the said proportions of hot sand or powdered stone are mixed with them by hand, or any suitable machine, and applied to the road.

.llaring thns described my invention,

1 claim as new and desire to secure by Letters Pathami te albertite, 01' any hard asphalt, and the same .combined with sand, powdered limestone, or any other like substance, all substantially as specified. EDOUARD J. DESMEDT.

-Witnesscs:

G120. W. MABEE, ALEX F Roenu'rs.

fiiitlti (tithe 

